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Treatment of sewage water by using microalgae coupled with membrane bioreactor (MBR) system

IR@NCL: CSIR-National Chemical Laboratory, Pune

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Title Treatment of sewage water by using microalgae coupled with membrane bioreactor (MBR) system
Creator Gera, Gayatri
Contributor Kamble, Sanjay
Subject Membrane System
Sewage wate
Description This thesis investigates the treatment of sewage water by using microalgae coupled with the membrane technology. Membrane technology was used to serve dual purpose of sewage water treatment as well as to study the harvesting of microalgae. However, harvesting of algal biomass remains a major challenge for the industrial researchers. The present study provides an evidence that backwashing which is currently being practiced worldwide can be a productive way to reduce fouling or blockage of the membrane and increase its harvesting potential, still no ultimate solution for the complete prevention of biofouling of membranes have been developed. In the present research, study was carried out to reduce the residence time for the treatment of sewage water using microalgae by using local microalgae isolates and starving them for the nutrients. Immobilization of standard culture was studied for the sewage water treatment to make the process feasible on large scale. Studies on different membrane materials as well as operating parameters were investigated to choose the best membrane for harvesting the grown algal biomass. Economic analysis for the whole process was examined by considering a village as a case study
“Microalgae in combination with membrane technology is an emerging process to combat the ever increasing pollution in the water bodies (rivers, lakes and sea) along with CO2 sequestration in a eco-friendly way without using the chemicals. As a microalga cultivates under four different conditions (photoautotrophic, heterotrophic, mixotrophic and photohetrotrophic), it can uptake nutrients, organic compounds, inorganic carbon (in the form of CO2)in the presence of bacteria and uses natural sunlight as a energy source for their growth. In short, microalgae are versatile unicellular species which not only prevents the eutrophication of the water bodies but also helps to increase the dissolved oxygen concentration thereby, helping the aquatic habitat to flourish in a natural way. As, microalgae were generally dispersed and suspended in the water, its harvesting is one of the bottleneck issue of the microalgal industries to grow forits mass production for various applications like fertilizers, biofuel, animal feed etc. Recently membrane technology shows sustainable solution for the harvesting of microalgae from water. Membrane filtration in combination with microalgal treatment for sewage water not only reduces the water footprints but also reduce the energy requirement as it does not require extensive oxygen like the conventional sewage water treatment plants. Therefore, microalgae in combination with membrane technology will be the futuristic technology for the treatment of sewage water. Conventional sewage water treatment plant required huge amount of air for aeration which is costly and also space required for plant is very large. The main objective of this dissertation is to (1) Screen and isolate microalgae from its natural habitat having potential to remove nutrients from sewage water.(2) Sewage water treatment using starved isolated microalgae species for the efficient removal of nutrients (TN and TP) (3)Optimization of process parameters for improving growth rate of microalgae and effective removal of nutrients.(4) Study the kinetics of nutrients uptake from the sewage water by immobilizing microalgae as well as to make effort for the reduction in the residence time. (5) Harvesting of microalgal biomass by applying membrane technology using different types of membranes. (6) Study the effects of various operational parameters such as Tran-membrane pressure (TMP), fluxes and membranes physicochemical properties parameters to get higher fluxes with maximum biomass recovery. (7) Economical analysis of the whole process for the treatment of sewage water using microalgae in combination with membrane technology for a small village. The microalgae-membrane based technology has a huge potential for the treatment of sewage as well as industrial wastewater in the near future. However, efficient design of photo-bioreactors or raceway pond using artificial radiation or solar radiation is essential. The commercial viability for the treatment of sewage water/industrial wastewater using microalgae-membrane based process will be depend upon the efficiency of microalgae for uptake of nutrients, design of photo-bioreactor for growth of microalgae and its harvesting using suitable membrane technology.”
CSIR and Goverment of India. project code #ESC0306
Date 2018-09-28T09:32:38Z
Type Thesis(Ph.D.)
Identifier http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4354
Language en
Format 147 p.
Publisher CSIR-National Chemical Laboratory